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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27cf409ac5df988b5d69d27c8b1cc1263a221868f238b2f31eea06f98bdd739c' 
  AND token = '+efwoI23LAsQ7ZmtQuCLlK5+WxAvnP3ZR8z64vSUSR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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