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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd78d089b95e3d9bd7ae9ba266d5f53ff623d1635f6b9028dc686e0618c7d3e2c' 
  AND token = '7ITl2yoQNh4/WOSjEq+vv0dLWHe8+DM6fDSy/YfZezI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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