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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b012a46157f2ec8d87f571d90ad4b54d440e64f97a295a52e59ac0f40075252' 
  AND token = 'x1ETxS81Km9MoegWPYcunv0lxE7Hg3JqFenHE8aDEbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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