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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c0ce6f54042a74c0fe83bbc5d9e8ea0ec11c2bb98fe11c5fdf0ba3175d6ac26' 
  AND token = '7b6U1rYuKBw9zeDPR0VNA8ABhpt+/PhZaFIntH4NPJo=' 
  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"
    }
  }
}