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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791a5b42bf9e787249819624c1ed6a82a96fe73426e9693a9c9bf7659d2e8b30' 
  AND token = 'weKOIUl8H9P5KEf9+acXt1EDR32jUsQAng4QnwEVIvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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