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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7176aa81c193229216b0a0320ec550c5977c9ed74cc01551621a3c203d91be6b' 
  AND token = 'ELWyqWmvnQEM7+FghbFmU+5CDq+fiadepx1uK8KpABQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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