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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e880e43c91c692fbd8281003aef4c59f715f3df8de09b7898f7c1067f323c8a' 
  AND token = 'lvfe0t3a/qVEDRhRZmJhT0HImmfBdBPNhi7jb9bowjQ=' 
  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"
    }
  }
}