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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126f1a553a15b1fa6ff4e4b85cf5f7bc21fb777802fbd87cd66a92eb7e39265e' 
  AND token = 'po3+fM+sqBwdteh1cGcR3hamJfCXQjiY6x5b+iDMPao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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