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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6c6f0c0313d1c44d264342a8e6e3680c9fdcbc1d81b3d641d13ac29c657373' 
  AND token = 'q8xONsAqJBBfozSldgGsTHvO87j1i+d0dW6KN2qsSP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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