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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c27ee71fa18564bf5ca3c433f2c930752bd6b0227f2cd15cc0d5cadd2baac9' 
  AND token = 'vxg/P9rzpME7fPAMC5y8OGMq9tzKjpcP0BJS3qdzLo0=' 
  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"
    }
  }
}