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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf3a3f5fa92cf527d376dca1531cd0f40b8ee3076c7decab82b882a5bcc82be' 
  AND token = '+VfByf0Rcwp7KQx1Ac9zVSBoCTHmyOt9fsTCQNw0n4g=' 
  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"
    }
  }
}