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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9658b194e9bcba022855d1c7ad35b11b108e6aee95fb4bab2b364415f8e8b001' 
  AND token = 'e+KmqlUGRC7FRZTx3tJiY8ljJDgL8mhroV7A4er3JDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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