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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f9310ff374f8c6c0f03dcbe293027f694b07bb91911fd78625cf548068df90' 
  AND token = 'VvoiadQbS2h3uEn3baMnoOafB+KD4sZd6ETjKB8dNTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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