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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886aa66b9cbf47982fe2282dbd91bfb69e17bf7d4ce9e053facb5efc28c91deb' 
  AND token = '4GyDKIR/mcSpu7eNb1H2f+rlC/ek0kREp5BVLv+TKwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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