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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a05de42cbcbb3a237317b9ef1d61a6b73b2a04f6813f8c3b420e4bc89d3d68' 
  AND token = 'be6ekZPRsCKlLxKh4Ph1qush4twWr/FDNaMIEKhXei8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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