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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b197ef5a0f56e272855527c3f5cf4e4a9c4634dffee8b0c5b56b4ea4ad6cdd01' 
  AND token = 'qD1JBSuSYUU4U/Zi/7d2vELO7N+qsfhXWJC2WzT33mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}