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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82173d9b441ff344b13a22ec0db7c7b54e7ba84094d3780f9b1ce16ed8f5c8ef' 
  AND token = 'vks+4SdsdZ5tA7Ei9dr9EWWqTP4OrDa9pu5Jeq6rVFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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