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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d740c200235b1c724e196d3ccf66e7816ee320ae0734bc497fff96b82310bb' 
  AND token = 'M8e44AOXsbGZCycqAeZHCc8mpBr2etYG7Nz6srovuWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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