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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0b3fe2744ff7811b5510ec6b58d1ab74e9db1bbd3346477845022b2134f201' 
  AND token = 'XBvowcgVukIDuVVTU2EXmYRwQvP1ObvUV1KT393J5JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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