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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0fb069b747fa5f7600f2813cc6904534f2ad1a279d30704a22154073f18935' 
  AND token = 'UzGO2ljyvfkw/vvuds4P991ut5aerguxB8wptddakH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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