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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8041fdbccfe3c05c2c5b937d21f666116b22173823fd6d7207be410cfd37e483' 
  AND token = '7hn9pH6wtSDxwxXZjG9TlCSXpxixFbT70EygBcfuhyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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