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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '251feaee01557ed82ee6929f93e488a48178ee234bd60d3974e77ae053c6a2b7' 
  AND token = 'r2kDvQPeabnV7z10XKftFnPJHeRNff6DorAc0vD1YuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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