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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d7140c0219397e1bbc23bf68733e6a015d31a0948671831284fa0eee85a6cf' 
  AND token = '0Hk9LGctjzY58sB8LjBm7hydukqTvdGTXgxcB2E9i2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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