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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a176b7c89ba44a2ed671d4031499c4db00081aa68085378495b01471e45cf17' 
  AND token = 'pc0DAujIz8ATB8Wh55g8HmbUyrVbA0PHdn6DTxs88mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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