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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96e5fc3fa0b413eb5ce80248b5a00347af3b857b469c3ba9ec847f07e51df1d' 
  AND token = 'VMawWHeb+zDwwaOa6USCgNlmCTw2Nbm8c6f0ghGjwgs=' 
  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"
    }
  }
}