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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8e999699865a5c9d5de9e297fb1478813e3405245f45599edb900be617272f' 
  AND token = 'P223SqUJ/iSiuK95HHiTFRFEmHwP6ubZzZt2hsSyu1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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