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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6c07ec5dfa8d4b393e5101de8c689b0c37cf0ca483fedf7765730196819a34' 
  AND token = 'YkrjK99QBeG9fyi/FNDWjFKI37k3fCT3EpOX4TD+JOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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