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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea07797b38f47d52e5dcedac4bc746bc2d5ce7f6c3a1a70e34250f97b8aadbc8' 
  AND token = 'iVmXCD5o2ZH42pujehs5eG1/g4kt1tNO8UtlG9BPSQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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