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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b168df5d94d1a44ca1182a645fc949c941a24f05c4e1e8bd45b125511b43aca' 
  AND token = 'oImpBBxcCLcV3Y0nbWP6NwuDgyrEzLCRHFxT4EYrmag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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