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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56211417bcf28516d5344ef7ec1242e3f7116f47570c7a633e0a5d442dda42a2' 
  AND token = 'tWthnc/Q45QN/hs9f7RD3qkFvLICwv1rJ46hkAIQ1yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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