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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63cfa3bfa0c7c00a7e6b6e45587a37f1d713b24acf4b2fe6be0f84f1a1713121' 
  AND token = 'jaIc2sAgq9Vr68hZWhXYAMtbOMiy+TVxrM5LX4vX/cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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