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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d943975bb7d7a328226d220c3186db6f609d27e4d320a40b5273e9b51afd85' 
  AND token = 'f4SKoKTMT+8+MAflJ1UCftuPMCi4oeYmAPLgvDbfFck=' 
  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"
    }
  }
}