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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ca201de363f2084d3ca071b92956209da512e73228a86c30561c8e597751fad' 
  AND token = 'ZTV+6dqKEufEQUlWz6A0xhVUMXVAKW3JZNVVPBXNmOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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