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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc7c6c502eb8924b89bc9354702f7a1a888b8ec2a5cd90a467d2a6c113e92b2' 
  AND token = 'rhpz6KWsMoiedDhGNJ6yAJcH/QXrzd80jzaV2kSVRdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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