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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c362101b75945f9a2d9cf6536a4a44a494f980e83220ec6afb37b4511e02444e' 
  AND token = 'mXteIJ7CCyUuczKC7bLQWFVZydmmIktZFrY2CIm7o1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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