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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2467d2270c9d9029de55065939f427813754c88f8ad51d53fbebcc74e4ba1d' 
  AND token = 'OGn13NSOmLzfDPpcX4tfCDdRCw3Vfxlrnm8xaFm8pK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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