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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d0a266d3f3b816b5d633fd454b41182b3be7772220b342f53a7b812cfeac7d' 
  AND token = 'Ai7IqTNmRLO9+1mj0X9QNbSzLuEKPeaf5tEc+hVnrZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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