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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c6e70516331005cf7294f33209617b1a8c8311aa12fc7ac34f202c7f7c8dfe' 
  AND token = '/EabKiSJBDY7Nv5HU+d1gGS/N/onEGBvk72jxSY7icc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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