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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7f6ee9258d88f33d3fdc96e151dc3422a60e50468bf9f3748ae0bf2456ad77' 
  AND token = 'lqY44oi5irS4VRrDQmePnrY8JW0mWtnLrubu5z/VYSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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