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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4016894c6cbe7abff2c5f1299cd811b13e74e9419455ebea9a39ba06141578' 
  AND token = 'y9Psok/zNSIxwGEMNHsSnu/0xWl+F6x0EXqRrs5T1vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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