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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc71687e7c8434079117b6fc10622c7c866e85405d3349a551ff0a8f96ccd8b' 
  AND token = 'w3TokHFRA/H1WtYBOS47/NBOUO5f+Phv53brfDjc/+k=' 
  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"
    }
  }
}