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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a3f2a63025420c6d010b7f6d0f6f836cbc59d8b1af6e961bc3b311c5563ea8' 
  AND token = 'XWOHXn3Ob+/hBigvBzR6NdAaVUhPU9/IbSfsx58kPJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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