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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b39f2b0c9659cbe80f02470ed0beb5642acfe871647745af33e44472499881' 
  AND token = 'ogVciFo2J0oh4Tc1lzw6kY2d+/WvfTl5JEm8gbvMa40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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