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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae69468babb2a5c114481bc422d4ed803f0121ca6810d60755b840ae58d0076f' 
  AND token = '5U4x8xc8QC4RLGgZG6g60qXZoY/C0XZn61Iud586pvA=' 
  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"
    }
  }
}